Fix bind errors (#5986)

* Add ability to bind to a common tcp/udp port

* Extend port range for local-net sanity and fix validator executable

netutil/src/lib.rs

@@ -58,22 +58,9 @@ pub fn get_public_ip_addr(ip_echo_server_addr: &SocketAddr) -> Result<IpAddr, St
 // `ip_echo_server_addr`
 pub fn verify_reachable_ports(
     ip_echo_server_addr: &SocketAddr,
-    tcp_ports: &[u16],
+    tcp_listeners: Vec<(u16, TcpListener)>,
     udp_sockets: &[&UdpSocket],
 ) {
-    let tcp: Vec<(_, _)> = tcp_ports
-        .iter()
-        .map(|port| {
-            (
-                port,
-                TcpListener::bind(&SocketAddr::from(([0, 0, 0, 0], *port))).unwrap_or_else(|err| {
-                    error!("Unable to bind to tcp/{}: {}", port, err);
-                    std::process::exit(1);
-                }),
-            )
-        })
-        .collect();
-
     let udp: Vec<(_, _)> = udp_sockets
         .iter()
         .map(|udp_socket| {
@@ -88,9 +75,10 @@ pub fn verify_reachable_ports(
 
     info!(
         "Checking that tcp ports {:?} and udp ports {:?} are reachable from {:?}",
-        tcp_ports, udp_ports, ip_echo_server_addr
+        tcp_listeners, udp_ports, ip_echo_server_addr
     );
 
+    let tcp_ports: Vec<_> = tcp_listeners.iter().map(|(port, _)| *port).collect();
     let _ = ip_echo_server_request(
         ip_echo_server_addr,
         IpEchoServerMessage::new(&tcp_ports, &udp_ports),
@@ -98,9 +86,8 @@ pub fn verify_reachable_ports(
     .map_err(|err| warn!("ip_echo_server request failed: {}", err));
 
     // Wait for a connection to open on each TCP port
-    for (port, tcp_listener) in tcp {
+    for (port, tcp_listener) in tcp_listeners {
         let (sender, receiver) = channel();
-        let port = *port;
         std::thread::spawn(move || {
             debug!("Waiting for incoming connection on tcp/{}", port);
             let _ = tcp_listener.incoming().next().expect("tcp incoming failed");
@@ -230,6 +217,30 @@ fn udp_socket(reuseaddr: bool) -> io::Result<Socket> {
     Ok(sock)
 }
 
+// Find a port in the given range that is available for both TCP and UDP
+pub fn bind_common_in_range(range: PortRange) -> io::Result<(u16, (UdpSocket, TcpListener))> {
+    let (start, end) = range;
+    let mut tries_left = end - start;
+    let mut rand_port = thread_rng().gen_range(start, end);
+    loop {
+        match bind_common(rand_port, false) {
+            Ok((sock, listener)) => {
+                break Result::Ok((sock.local_addr().unwrap().port(), (sock, listener)));
+            }
+            Err(err) => {
+                if tries_left == 0 {
+                    return Err(err);
+                }
+            }
+        }
+        rand_port += 1;
+        if rand_port == end {
+            rand_port = start;
+        }
+        tries_left -= 1;
+    }
+}
+
 pub fn bind_in_range(range: PortRange) -> io::Result<(u16, UdpSocket)> {
     let sock = udp_socket(false)?;
 
@@ -292,6 +303,21 @@ pub fn bind_to(port: u16, reuseaddr: bool) -> io::Result<UdpSocket> {
     }
 }
 
+// binds both a UdpSocket and a TcpListener
+pub fn bind_common(port: u16, reuseaddr: bool) -> io::Result<(UdpSocket, TcpListener)> {
+    let sock = udp_socket(reuseaddr)?;
+
+    let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), port);
+    let sock_addr = SockAddr::from(addr);
+    match sock.bind(&sock_addr) {
+        Ok(_) => match TcpListener::bind(&addr) {
+            Ok(listener) => Result::Ok((sock.into_udp_socket(), listener)),
+            Err(err) => Err(err),
+        },
+        Err(err) => Err(err),
+    }
+}
+
 pub fn find_available_port_in_range(range: PortRange) -> io::Result<u16> {
     let (start, end) = range;
     let mut tries_left = end - start;
@@ -386,4 +412,10 @@ mod tests {
         let port = find_available_port_in_range((3000, 3050)).unwrap();
         assert!(3000 <= port && port < 3050);
     }
+
+    #[test]
+    fn test_bind_common_in_range() {
+        let (port, _) = bind_common_in_range((3000, 3050)).unwrap();
+        assert!(3000 <= port && port < 3050);
+    }
 }